US5763602A - Methods of syntheses of phthalocyanine compounds - Google Patents

Methods of syntheses of phthalocyanine compounds Download PDF

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US5763602A
US5763602A US08/724,347 US72434796A US5763602A US 5763602 A US5763602 A US 5763602A US 72434796 A US72434796 A US 72434796A US 5763602 A US5763602 A US 5763602A
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ligand
phthalocyanine
displacing
organic acid
central silicon
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US08/724,347
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Ying-Syi Li
Malcolm E. Kenney
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University Hospitals of Cleveland
HPD Laboratories Inc
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Priority to US08/724,347 priority Critical patent/US5763602A/en
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Priority to KR1019997002241A priority patent/KR20000036186A/en
Priority to AT97945416T priority patent/ATE244279T1/en
Priority to PCT/US1997/017690 priority patent/WO1998014521A1/en
Priority to JP51683598A priority patent/JP2001506584A/en
Priority to AU46626/97A priority patent/AU4662697A/en
Priority to EP97945416A priority patent/EP1023399B1/en
Priority to CA002267389A priority patent/CA2267389A1/en
Priority to DE69723322T priority patent/DE69723322T2/en
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Assigned to HPD LABORATORIES, INC. reassignment HPD LABORATORIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLOCK DRUG COMPANY, INC.
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B47/00—Porphines; Azaporphines
    • C09B47/04—Phthalocyanines abbreviation: Pc
    • C09B47/30—Metal-free phthalocyanines
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/22—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains four or more hetero rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K41/00—Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
    • A61K41/0057—Photodynamic therapy with a photosensitizer, i.e. agent able to produce reactive oxygen species upon exposure to light or radiation, e.g. UV or visible light; photocleavage of nucleic acids with an agent
    • A61K41/0071—PDT with porphyrins having exactly 20 ring atoms, i.e. based on the non-expanded tetrapyrrolic ring system, e.g. bacteriochlorin, chlorin-e6, or phthalocyanines
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B47/00—Porphines; Azaporphines
    • C09B47/04—Phthalocyanines abbreviation: Pc
    • C09B47/08—Preparation from other phthalocyanine compounds, e.g. cobaltphthalocyanineamine complex

Definitions

  • Conventional methods for synthesizing phthalocyanine pharmaceutical compounds employ a blocking methyl group to prevent the addition of more than one aminosiloxy group on the central silicon of the phthalocyanine precursor. Once the aminosiloxy ligand has been added, this blocking group is displaced with the desired HO group through a photolysis step.
  • the present invention provides improved methods for synthesizing phthalocyanines, particularly HOSiPcOSi(CH 3 )2(CH 2 ) 3 N(CH 3 ) 2 , which do not involve photolysis, and which produce a purity of at least about 95%, and in the preferred embodiment of the first method of synthesizing Pc 4, provide a yield of greater than about 70% and typically greater than 80%.
  • the first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably a Cl 3 CCOO ligand; then displacing the Cl 3 CCOO ligand with an HO ligand.
  • the second method for making Pc4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid ligand, preferably a Cl 3 CCOO ligand; then displacing the Cl 3 CCOO ligand with an Ho ligand; and then displacing the iodo group with a dimethylamino group.
  • the invention also relates to methods for making two novel phthalocyanine compounds HOSiPcOSi (CH 3 ) 2 (CH 2 ) 3 I and SiPc OSi(CH 3 ) 2 (CH 2 ) 3 I! 2 , and to the compounds themselves which are useful as dyes and in photodynamic therapy.
  • phthalocyanine compounds having the following general structure: ##STR1## wherein: M is (G) a Y (OSi(CH 3 ) 2 (CH 2 ) b N c (R') d (R") e ) f X g ! p
  • Y is Si
  • R' is selected from the group of H, C, CH 2 , CH 3 , C 2 H 5 , C 4 H 9 , C 4 H 8 NH, C 4 H 8 N, C 4 H 8 NCH 3 ,, C 4 H 8 S, C 4 H 8 O, C 4 H 8 Se, CH 2 CH 3 , (CH 2 ) 3 (CH 3 ) 2 , OC(O)CH 3 , OC(O), (CH 3 ) 2 (CH 2 ) 11 , CS, CO, CSe, OH, C 4 H 8 N(CH 2 ) 3 CH 3 , (CH 2 ) 3 N(CH 3 ) 2 , C(O)C 27 H 30 N 2 O, (CH 2 ) n N((CH) 0 (CH 3 )) 2 , an alkyl group having from 1 to 12 carbon atoms;
  • R" is selected from the group of H, SO 2 CH 3 , (CH 2 ) 2 N(CH 3 ) 2 , (CH 2 ) 11 CH 3 , C(S)NHC 6 H 11 O 5 , (CH 2 ) n N((CH) 0 (CH 3 )) 2 , and an alkyl group having from 1 to 12 carbon atoms;
  • G is OH
  • X is selected from the group of: I; F; Cl; or Br;
  • b an integer from 2 to 12;
  • d 0, 1, 2, or 3;
  • e 0, 1, or 2;
  • n an integer from 1 to 12;
  • o an integer from 1 to 11;
  • M is HOSiOSi (CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , HOSiOSi (CH 3 ) 2 (CH 2 ) 3 I or Si OSi(CH 3 ) 2 (CH 2 ) 3 I! 2 .
  • the first new method of synthesis avoids a photolysis step; an extra aminosiloxy ligand is added on the central silicon of the phthalocyanine precursor and then the sequential displacement of this extra ligand by an organic acid ligand, preferably a Cl 3 CCOO ligand and the desired HO ligand.
  • the organic acid is a non-mineral acid, which has an acidity of Cl 3 CCOOH, is soluble in the organic solvent used in the reaction, and includes but is not limited to Cl 3 CCOOH and Cl 2 CHCOOH.
  • the first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably a Cl 3 CCOO ligand; then displacing the Cl 3 CCOO ligand with an HO ligand.
  • the steps in the preferred embodiment of the first synthesis, that are believed to occur are summarized as: ##STR3## That is, the photolysis step is avoided; this results in a phthalocyanine product having an improved purity.
  • the phthalocyanine produced according to the first improved method has a purity of about 98%; in contrast to the method of the prior art where the purity is about 95%. Further, the improved method provides a higher yield, that is, about 70% to 80%, rather than about 50% to 60%.
  • the second synthesis of HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 uses a different approach from both the prior art and the first method.
  • the second method for making Pc 4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid ligand, preferably a Cl 3 CCOO ligand; then displacing the Cl 3 CCOO ligand with an HO ligand; and then displacing the iodo group with a dimethylamino group.
  • a hydroxysiloxysilicon phthalocyanine in which the siloxy ligand terminates in an iodo group is first formed. Then, in the final reaction the iodo group is displaced with the desired dimethylamino group.
  • the aminosiloxy ligand is built up stepwise on the phthalocyanine rather than being formed separately.
  • the Pc4 produced according to the second improved method have a purity of about 98%; in contrast to the methods of the prior art where the purity is about 95%.
  • This second synthesis is particularly useful because it offers a procedure for making Pc 4 labeled with 14 C.
  • the reagent 14 C labeled NH(CH 3 ) 2 is added in the last step of the method, preferably with unlabeled with HN(CH 3 ) 2 .
  • Suitable 14 C labeled NH(CH 3 ) 2 is commercially available from New England Nuclear Corporation, 549 Albany Street, Boston, Mass. 02118 and Amersham Life Science, Inc., 2636 South Clearbrook Drive, Arlington Heights, Ill.
  • the 14 C labeled Pc 4 is useful reagent for pharmacokinetic studies of Pc 4.
  • HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 I and SiPc OSi(CH 3 ) 2 (CH 2 ) 3 I! 2 which are made as intermediates in the method for making Pc 4, are also useful in photodynamic therapy, including therapies disclosed in U.S. Pat. No. 5,166,197, issued Nov. 24, 1992, to Kenney et. al.; U.S. Pat. No. 5,484,778, issued Jan. 16, 1996, to Kenney et. al.; and in "New Phthalocyanine Photosensitizers for Photodynamic Therapy", Oleinick, et. al. Photochemistry and Photobiology, (1993), Volume 57, pages 242-247, which are specifically incorporated herein by refeence.
  • Compounds HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 I and SiPc OSi(CH 3 ) 2 (CH 2 ) 3 I! 2 are also useful as reagents, and for experimental and research.
  • HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , Pc 4 was made by a synthesis in which CH 3 OSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 , SiPc OSi(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 ! 2 (Pc 12),
  • the aqueous layer was washed with 100 mL CH 2 Cl 2 , the washings were filtered, and the residue was washed with 200 mL CH 2 Cl 2
  • the organic layer was filtered, and the filtrate and CH 2 Cl 2 washings were combined and evaporated to dryness with a rotary evaporator at about 40° C.
  • the solid was dried at about 60 torr, and at about 60° C. to provide 647 mg of the blue-green compound, Cl 3 CCOOSiPcOSi-(CH 3 ) 2 (CH 2 ) 3 N(CH 3 ) 2 .
  • the precipitate was recovered by filtration, washed with a 1:4, 15 mL of CH 2 Cl 2 -pentane solution and 20 mL pentanedried at about 60 torr, 60° C. and weighed (416 mg, 0.580 mmol, 83% based on SiPc(OH) 2 used).
  • Pc 4 was also made by a synthesis in which CH 3 OSi(CH 3 ) 2 (CH 2 ) 3 I, SiPc OSi(CH 3 ) 2 (CH 2 ) 3 I! 2 also referred to herein as "Pc 59", HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 I also referred to herein as "Pc 58", and finally Pc 4 were prepared in sequence.
  • the solid was chromatographed on an Al 2 O 3 V substrate, with CH 2 Cl 2 -ethyl acetate, in a 1:1 ratio, dissolved in 4 mL CH 2 Cl 2 , precipitated with 6 mL pentane, recovered by filtration, washed with 20 mL pentane and a 1:1, 20 mL ethanol-water solution, dried at about 60 torr, about 60° C. and weighed (188 mg, 0.235 mmol, 48%).
  • the solid was extracted into 20 mL CH 2 Cl 2 , recovered by evaporating the extract with a rotary evaporator (room temperature), dissolved in 1 mL CH 2 Cl 2 , precipitated with 4 mL pentane, recovered by filtration, washed with a solution of CH 2 Cl 2 and 1:4, 15 mL pentane, 10 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, at about 60° C. and weighed (22.1 mg, 0.0308 mmol, 80%, 30% based on SiPc(OH) 2 used).
  • Example 2 The procedure of Example 2 was followed, except in the final stage a smaller ratio of HN(CH 3 ) 2 to HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 I was employed. Specifically, a stirred suspension of 40.5 mg, 0.0506 mmol HOSiPcOSi(CH 3 ) 2 (CH 2 ) 3 I, Pc 58, 2.4 mg, 0.017 mmol K 2 CO 3 , a solution of HN(CH 3 ) 2 in 2M, 0.2 mL, 0.4 mmol tetrahydrofuran and 4.8 mL tetrahydrofuran (4.8 mL) in a 5 mL heavy-wall reaction vial was warmed at about 60° C.
  • Example 2 The synthesis of Example 2 is followed, except that a metallic derivative of HN(CH 3 ) 2 , preferably a group I metal derivative, including, for example LiN(CH 3 ) 2 and NaN(CH 3 ) 2 , is substituted for HN(CH 3 ) 2 . Since the halosiloxy phthalocyanine and the amine may be used in an approximately 1:1 ratio, and thus is more efficient.
  • a metallic derivative of HN(CH 3 ) 2 preferably a group I metal derivative, including, for example LiN(CH 3 ) 2 and NaN(CH 3 ) 2 , is substituted for HN(CH 3 ) 2 . Since the halosiloxy phthalocyanine and the amine may be used in an approximately 1:1 ratio, and thus is more efficient.
  • Example 2 The procedure of Example 2 is followed except that a mixture of 14 C labeled NH(CH 3 ) 2 and HN(CH 3 ) 2 , is added in the last reaction with, to provide Pc 4 labeled with 14 C.

Abstract

The present invention provides improved methods for synthesizing phthalocyanines, particularly HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, which do not involve photolysis, and which produces purity of at least about 95%, and in the preferred embodiment of the first method of synthesis provide a yield of greater than about 70% and typically greater than 80%. The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably Cl3 CCOO ligand; then displacing the Cl3 CCOO ligand with an HO ligand. The second method for making Pc4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid, preferably a Cl3 CCOO ligand; then displacing the a Cl3 CCOO ligand with an HO ligand; and then displacing the iodo group with a dimethylamino group.

Description

BACKGROUND OF THE INVENTION
Conventional methods for synthesizing phthalocyanine pharmaceutical compounds, particularly HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, employ a blocking methyl group to prevent the addition of more than one aminosiloxy group on the central silicon of the phthalocyanine precursor. Once the aminosiloxy ligand has been added, this blocking group is displaced with the desired HO group through a photolysis step.
However, this method of synthesis has various disadvantages; photolysis requires unusual apparatus, is quite time consuming, and results in a relatively low yield, typically about 50 to 60% of the product. It would be desirable to have a method for synthesizing phthalocyanines, particularly HOSiPcOSi(CH3)2(CH2)3 N(CH3)2 that does not involve a photolysis step, and provides an improved yield.
SUMMARY OF THE INVENTION
The present invention provides improved methods for synthesizing phthalocyanines, particularly HOSiPcOSi(CH3)2(CH2)3 N(CH3)2, which do not involve photolysis, and which produce a purity of at least about 95%, and in the preferred embodiment of the first method of synthesizing Pc 4, provide a yield of greater than about 70% and typically greater than 80%. The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably a Cl3 CCOO ligand; then displacing the Cl3 CCOO ligand with an HO ligand.
The second method for making Pc4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid ligand, preferably a Cl3 CCOO ligand; then displacing the Cl3 CCOO ligand with an Ho ligand; and then displacing the iodo group with a dimethylamino group.
The invention also relates to methods for making two novel phthalocyanine compounds HOSiPcOSi (CH3)2 (CH2)3 I and SiPc OSi(CH3)2 (CH2)3 I!2, and to the compounds themselves which are useful as dyes and in photodynamic therapy.
DESCRIPTION OF THE INVENTION
The methods of the present invention are useful in making phthalocyanine compounds having the following general structure: ##STR1## wherein: M is (G)a Y (OSi(CH3)2 (CH2)b Nc (R')d (R")e)f Xg !p
Y is Si;
R' is selected from the group of H, C, CH2, CH3, C2 H5, C4 H9, C4 H8 NH, C4 H8 N, C4 H8 NCH3,, C4 H8 S, C4 H8 O, C4 H8 Se, CH2 CH3, (CH2)3 (CH3)2, OC(O)CH3, OC(O), (CH3)2 (CH2)11, CS, CO, CSe, OH, C4 H8 N(CH2)3 CH3, (CH2)3 N(CH3)2, C(O)C27 H30 N2 O, (CH2)n N((CH)0 (CH3))2, an alkyl group having from 1 to 12 carbon atoms;
R" is selected from the group of H, SO2 CH3, (CH2)2 N(CH3)2, (CH2)11 CH3, C(S)NHC6 H11 O5, (CH2)n N((CH)0 (CH3))2, and an alkyl group having from 1 to 12 carbon atoms;
G is OH;
X is selected from the group of: I; F; Cl; or Br;
a=0 or 1;
b=an integer from 2 to 12;
c=0, 1;
d=0, 1, 2, or 3;
e=0, 1, or 2;
f=1;
g=0 or 1;
n=an integer from 1 to 12;
o=an integer from 1 to 11;
p=1 where a is 1,or 2 where a is 0.
Preferably, M is HOSiOSi (CH3)2 (CH2)3 N(CH3)2, HOSiOSi (CH3)2 (CH2)3 I or Si OSi(CH3)2 (CH2)3 I!2.
In the method for making Pc 4 of the prior art, the steps that are believed to occur are: ##STR2## where "H" represents a source of hydrogen. The byproducts in reactions (3) and (4) are different. The prior art synthesis uses a blocking methyl group to prevent the addition of more than one aminosiloxy group on the central silicon of the phthalocyanine precursor. Then, after the aminosiloxy ligand has been added, this blocking group is displaced with the desired HO group through a photolysis step.
The First Method of Synthesizing Pc 4
In contrast to the prior art, the first new method of synthesis, avoids a photolysis step; an extra aminosiloxy ligand is added on the central silicon of the phthalocyanine precursor and then the sequential displacement of this extra ligand by an organic acid ligand, preferably a Cl3 CCOO ligand and the desired HO ligand. The organic acid is a non-mineral acid, which has an acidity of Cl3 CCOOH, is soluble in the organic solvent used in the reaction, and includes but is not limited to Cl3 CCOOH and Cl2 CHCOOH.
The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor; adding a second aminosiloxy ligand to the central silicon of the phthalocyanine precursor; displacing the second aminosiloxy ligand by an organic acid ligand, preferably a Cl3 CCOO ligand; then displacing the Cl3 CCOO ligand with an HO ligand.
The steps in the preferred embodiment of the first synthesis, that are believed to occur are summarized as: ##STR3## That is, the photolysis step is avoided; this results in a phthalocyanine product having an improved purity. The phthalocyanine produced according to the first improved method has a purity of about 98%; in contrast to the method of the prior art where the purity is about 95%. Further, the improved method provides a higher yield, that is, about 70% to 80%, rather than about 50% to 60%.
The Second Synthesis of Pc 4
The second synthesis of HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2 uses a different approach from both the prior art and the first method. The second method for making Pc 4 is a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; providing a siloxy ligand with an iodo group; adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor; displacing the second siloxyiodo ligand by an organic acid ligand, preferably a Cl3 CCOO ligand; then displacing the Cl3 CCOO ligand with an HO ligand; and then displacing the iodo group with a dimethylamino group.
The steps that probably occur in the preferred embodiment of the second method of synthesis of Pc 4 can be summarized as: ##STR4##
In the second method for making Pc 4, a hydroxysiloxysilicon phthalocyanine in which the siloxy ligand terminates in an iodo group is first formed. Then, in the final reaction the iodo group is displaced with the desired dimethylamino group. Thus, in this approach the aminosiloxy ligand is built up stepwise on the phthalocyanine rather than being formed separately. The Pc4 produced according to the second improved method have a purity of about 98%; in contrast to the methods of the prior art where the purity is about 95%.
This second synthesis is particularly useful because it offers a procedure for making Pc 4 labeled with 14 C. The reagent 14 C labeled NH(CH3)2 is added in the last step of the method, preferably with unlabeled with HN(CH3)2. Suitable 14 C labeled NH(CH3)2 is commercially available from New England Nuclear Corporation, 549 Albany Street, Boston, Mass. 02118 and Amersham Life Science, Inc., 2636 South Clearbrook Drive, Arlington Heights, Ill. The 14 C labeled Pc 4 is useful reagent for pharmacokinetic studies of Pc 4.
Compounds HOSiPcOSi(CH3)2 (CH2)3 I and SiPc OSi(CH3)2 (CH2)3 I!2, which are made as intermediates in the method for making Pc 4, are also useful in photodynamic therapy, including therapies disclosed in U.S. Pat. No. 5,166,197, issued Nov. 24, 1992, to Kenney et. al.; U.S. Pat. No. 5,484,778, issued Jan. 16, 1996, to Kenney et. al.; and in "New Phthalocyanine Photosensitizers for Photodynamic Therapy", Oleinick, et. al. Photochemistry and Photobiology, (1993), Volume 57, pages 242-247, which are specifically incorporated herein by refeence. Compounds HOSiPcOSi(CH3)2 (CH2)3 I and SiPc OSi(CH3)2 (CH2)3 I!2, are also useful as reagents, and for experimental and research.
The following examples are intended to be illustrative only and not intended to in any way limit the scope of the invention.
EXAMPLE 1
Preferred Method for Synthesis of HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, Pc 4
HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, Pc 4, was made by a synthesis in which CH3 OSi(CH3)2 (CH2)3 N(CH3)2, SiPc OSi(CH3)2 (CH2)3 N(CH3)2 !2 (Pc 12),
Cl3 CCOOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, and finally Pc 4 were prepared in sequence.
Preparation of CH3 OSi(CH3)2 (CH2)3 N(CH3)2 CH3 OSi(CH3)2 (CH2)3 N(CH3)2 was prepared as described in U.S. Pat. No. 5,166,197, issued Nov. 24, 1992, to Kenney et al. and in "New Phthalocyanine Photosensitizers for Photodynamic Therapy", Oleinick, et. al. Photochemistry and Photobiology. 1993, volume 57, pages 242-247, at page 243.
Preparation of SiPc OSi(CH3)2 (CH2)3 N(CH3)2 !2 Pc 12.
A mixture of 980 mg, 5.59 mmol of CH3 OSi(CH3)2 (CH2)3 N(CH3)2 and a suspension of 400 mg, 0.697 mmol SiPc(OH)2 and 400 mL pyridine that had been dried by distillation (about 20 mL of distillate), was slowly distilled for 3 hours (about 20 mL of distillate) and then filtered. The filtrate was evaporated to dryness with a rotary evaporator at about 40° C., and the solid was washed with an 2:3, 150 mL ethanol-water solution, then dried at about 60 torr, about 70° C. and weighed 552 mg. NMR analysis revealed :(300 MHz, CDCl3): delta 9.61 (m, 1,4-Pc H), 8.31 (m, 2,3-Pc H), 1.60 (s, NCH3), 0.82 (m, gamma-CH2), -1.12 (m, beta-CH2), -2.30 (m, alpha-CH2), -2.91 (s, SiCH3). The resulting SiPc OSi(CH3)2 (CH2)3 N(CH3)2 !2 which is blue, is soluble in dimethylformamide and CH2 Cl2, and is insoluble in hexanes and water.
Preparation of Cl3 CCOOSiPcOSi(CH3)2 (CH2)3 N(CH3)2
A solution of 552 mg of SiPc OSi(CH3)2 (CH2)3 N(CH3)2 !2 also referred to herein as "Pc 12", 590 mg, 3.61 mmol trichloroacetic acid, and 90 mL CH2 Cl2, was stirred at room temperature for 5 hours. The resultant was mixed with 90 mL pyridine and then with 90 mL H2 O, and the mixture formed was separated. The aqueous layer was washed with 100 mL CH2 Cl2, the washings were filtered, and the residue was washed with 200 mL CH2 Cl2 The organic layer was filtered, and the filtrate and CH2 Cl2 washings were combined and evaporated to dryness with a rotary evaporator at about 40° C. The solid was dried at about 60 torr, and at about 60° C. to provide 647 mg of the blue-green compound, Cl3 CCOOSiPcOSi-(CH3)2 (CH2)3 N(CH3)2. NMR analysis revealed; (300 MHz, CDCl3) delta 9.68 (m, 1,4-Pc H), 8.19 (m, 2,3-Pc H), 1.61 (s, NCH3), 0.85 (m, gamma-CH2), -1.03 (m, beta-CH2), -2.16 (m, alpha-CH2), -2.78 (s, SiCH3).
Preparation of HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, Pc 4
A solution of 647 mg Cl3 CCOOSiPcOSi(CH3)2 (CH2)3 N(CH3)2 and 20 mL CH2 Cl2 was passed down a 3×24 cm chromatography column composed of Al2 O3 V. The loaded column was then eluted with a solution of 1.5 parts CH2 Cl2 -ethyl acetate, and the eluate was evaporated to dryness with a rotary evaporator at about 40° C. The solid was extracted into 20 mL CH2 Cl2, recovered by evaporating the extract with a rotary evaporator, dissolved in 3 ml of CH2 Cl2, and precipitated with 12 mL pentane. The precipitate was recovered by filtration, washed with a 1:4, 15 mL of CH2 Cl2 -pentane solution and 20 mL pentanedried at about 60 torr, 60° C. and weighed (416 mg, 0.580 mmol, 83% based on SiPc(OH)2 used). UV-vis (dimethylformamide) lambdamax (nm); epsilon (M-1 cm-1): 668; 230,000. NMR analysis revealed (300 MHz, 8.4 mM, CDCl3): delta 9.11 (m, 1,4-Pc H), 8.18 (m, 2,3-Pc H), 1.35 (s, NCH3), 0.60 (m, gamma-CH2), -1.36 (m, beta-CH2), -2.49 (m, alpha-CH2), -2.66 (s, SiOH), -3.10 (s, SiCH3).
EXAMPLE 2
Second Method for Synthesis of Pc 4.
Pc 4 was also made by a synthesis in which CH3 OSi(CH3)2 (CH2)3 I, SiPc OSi(CH3)2 (CH2)3 I!2 also referred to herein as "Pc 59", HOSiPcOSi(CH3)2 (CH2)3 I also referred to herein as "Pc 58", and finally Pc 4 were prepared in sequence.
Preparation of CH3 OSi(CH3)2 (CH2)3 I
A mixture of 10.6 g, 0.0700 mol CH3 OSi(CH3)2 (CH2)3 Cl, 20.8 g, 0.105 mol NaI and 100 mL acetone was refluxed for 2 days and filtered. The solid was washed with 50 mL acetone, and the washings and filtrate were combined and concentrated with a rotary evaporator at about 30° C. The concentrate was mixed with 50 mL ether, and the resulting suspension was filtered. The solid was washed with 100 ml ether, and the washings and the filtrate were combined and concentrated with a rotary evaporator at about 30° C. The concentrate weighed 14.9 g. NMR analysis at 200 MHz, in CDCl3 revealed: delta 3.40 (s, CH3 O ), 3.17 (m, gamma-CH2), 1.84 (m, beta-CH2), 0.67 (m, alpha-CH2), 0.08 (s, SiCH3). The CH3 OSi(CH3)2 (CH2)3 I is a yellow, mobile liquid.
Preparation of SiPc OSi(CH3)2 (CH2)3 I!2
A mixture of 1.80 g CH3 OSi(CH3)2 (CH2)3 I, 401 mg, 0.698 mmol SiPc(OH)2 and 300 mL xylene was slowly distilled for 6 hours to produce about 35 mL of distillate, and the mixture was evaporated to dryness with a rotary evaporator at about 50° C. The solid was washed with 75 mL ethanol and a 1:1, 70 mL ethanol-water solution, then dried at about 60 torr, 60° C., and weighed (567 mg, 0.537 mmol, 77 %). NMR analysis at 300 MHz, in CDCl3 revealed: delta 9.65 (m, 1,4-Pc H), 8.34 (m, 2,3-Pc H), 1.75 (m, gamma-CH2), -0.84 (m, beta-CH2), -2.21 (m, alpha-CH2), -2.87 (s, SiCH3). The SiPc OSi(CH3)2 (CH2)3 I!2,which is blue, is soluble in dimethylformamide and CH2 Cl2 and is insoluble in hexanes and water.
Preparation of HOSiPcOSi(CH3)2 (CH2)3 I
A solution of 514 mg, 0.488 mmol unchromatographed SiPc OSi(CH3)2 (CH2)3 I!2, 1.64 g, 10.0 mmol. trichioroacetic acid and 250 mL CH2 Cl2 was stirred at room temperature for 5 hours, then mixed with 100 ML pyridine and then with 100 mL H2 O. The aqueous layer was washed with 60 mL CH2 Cl2, the washings were filtered, and the residue was washed with 100 mL CH2 Cl2. The organic layer was filtered and the filtrate and CH2 Cl2 washings were combined and evaporated to dryness with a rotary evaporator (about 40° C.). The solid was chromatographed on an Al2 O3 V substrate, with CH2 Cl2 -ethyl acetate, in a 1:1 ratio, dissolved in 4 mL CH2 Cl2, precipitated with 6 mL pentane, recovered by filtration, washed with 20 mL pentane and a 1:1, 20 mL ethanol-water solution, dried at about 60 torr, about 60° C. and weighed (188 mg, 0.235 mmol, 48%). NMR analysis revealed (300 MHz, 7.0 mM, CDCl3): delta 9.22 (m, 1,4-Pc H), 8.22 (m, 2,3-Pc H), 1.59 (m, gamma-CH2), -1.01 (m, beta-CH2), -2.36 (m, alpha-CH2), -3.04 (s, SiCH3), -3.22 (s, SiOH). The HOSiPcOSi(CH3)2 (CH2)3 I, which is blue, is soluble in dimethylformamide and CH2 Cl2 and is insoluble in hexanes and water.
Preparation of HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, Pc 4, the Final Stage
A stirred suspension of 30.9 mg, 0.0386 mmol HOSiPcOSi(CH3)2 (CH2)3 I, 5.2 mg, 0.038 mmol K2 CO3, a solution of HN(CH3)2 in 2M, 0.5 mL, 1 mmol tetrahydrofuran solution and 9.5 mL tetrahydrofuran in a pressure tube (15 mL) was warmed at about 60° C. for 48 hours and evaporated to dryness with a rotary evaporator at about 30° C. The solid was extracted into 20 mL CH2 Cl2, recovered by evaporating the extract with a rotary evaporator (room temperature), dissolved in 1 mL CH2 Cl2, precipitated with 4 mL pentane, recovered by filtration, washed with a solution of CH2 Cl2 and 1:4, 15 mL pentane, 10 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, at about 60° C. and weighed (22.1 mg, 0.0308 mmol, 80%, 30% based on SiPc(OH)2 used).
EXAMPLE 2a
The procedure of Example 2 was followed, except in the final stage a smaller ratio of HN(CH3)2 to HOSiPcOSi(CH3)2 (CH2)3 I was employed. Specifically, a stirred suspension of 40.5 mg, 0.0506 mmol HOSiPcOSi(CH3)2 (CH2)3 I, Pc 58, 2.4 mg, 0.017 mmol K2 CO3, a solution of HN(CH3)2 in 2M, 0.2 mL, 0.4 mmol tetrahydrofuran and 4.8 mL tetrahydrofuran (4.8 mL) in a 5 mL heavy-wall reaction vial was warmed at about 60° C. for 24 hours, and evaporated to dryness with a rotary evaporator at about 30° C. The solid was extracted into 20 mL CH2 Cl2, recovered by evaporating the extract to dryness with a rotary evaporator at room temperature, dissolved in 1 mL CH2 Cl2, precipitated with 4 mL pentane, recovered by filtration, washed with a 1:4, 15 mL CH2 Cl2 -pentane solution, 10 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, at about 60° C., chromatographed on a Al2 O3 III substrate using ethyl acetate-methanol, in a ratio of 10:1, washed with 15 mL pentane and an 1:4, 10 mL ethanol-water solution, dried at about 60 torr, 60° C. and weighed (17.5 mg, 0.0243 mmol, 48%, 18% based on SiPc(OH)2 used).
EXAMPLE 2b
The synthesis of Example 2 is followed, except that a metallic derivative of HN(CH3)2, preferably a group I metal derivative, including, for example LiN(CH3)2 and NaN(CH3)2, is substituted for HN(CH3)2. Since the halosiloxy phthalocyanine and the amine may be used in an approximately 1:1 ratio, and thus is more efficient.
EXAMPLE 2c
The procedure of Example 2 is followed except that a mixture of 14 C labeled NH(CH3)2 and HN(CH3)2, is added in the last reaction with, to provide Pc 4 labeled with 14 C.
Although one embodiment of this invention has been shown and described, various adaptations and modifications can be made without departing from the scope of the invention as defined in the appended claims.

Claims (12)

What is claimed is:
1. A method for synthesizing a phthalocyanine compound comprising the following steps:
a. providing a phthalocyanine precursor having a central silicon;
b. adding two aminosiloxy ligands to the central silicon of the phthalocyanine precursor;
c. displacing one of the aminosiloxy ligands by an organic acid ligand;
d. then displacing the organic acid ligand with an hydroxyl ligand;
to provide a phthalocyanine compound wherein the central silicon has an aminosiloxy lignads and an hydroxyl ligand.
2. The method of claim 1, wherein the phthalocyanine compound is HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2, the phthalocyanine precursor is SiPc(OH)2, and the amino siloxy ligand is CH3 OSi(CH3)2 (CH2)3 N(CH3)2.
3. The method of claim 2, wherein the organic acid ligand is Cl3 CCOO.
4. The method of claim 1, wherein the synthesis is further accomplished without photolysis.
5. A method for synthesizing a phthalocyanine compound comprising the following steps:
a. providing a phthalocyanine precursor having a central silicon;
b. providing a siloxy ligand with iodo group;
c. adding a first and second siloxyiodo ligand to the central silicon of the phthalocyanine precursor.
6. The method of claim 4, wherein the phthalocyanine produced from step c is SiPc OSi(CH3)2 (CH2)3 I!2.
7. The method of claim 5, further comprising the steps of:
d. displacing one of the two siloxyiodo ligand by an organic acid ligand;
e. then displacing the organic acid ligand with an HO ligand.
8. The method of claim 7, wherein the phthalocyanine produced from step e is HOSiPcOSi(CH3)2 (CH2)3 I.
9. The method of claim 5, further comprising the steps of:
d. displacing one of the two siloxyiodo ligands by an organic acid ligand;
e. then displacing the organic acid ligand with an HO ligand;
f. then displacing the iodo group with a dimethylamino group.
10. The method of claim 9, wherein the phthalocyanine compound is HOSiPcOSi(CH3)2 (CH2)3 N(CH3)2 and the organic acid ligand is Cl3 CCOO ligand.
11. The method of claim 9, wherein the dimethylamino group is 14 C labeled.
12. The method of claim 9, wherein the dimethylamine group is provided by a group I metal dimethylamine.
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